I didn’t say that...I was quoting someone. That’s what I use italics for....
“So a siphon requires both gravity and atmosphere.”
Not according to scientists that have experimentally done it in a vacuum. Everyone keeps confusing atmospheric pressure and hydrostatic pressure. The reason the siphon breaks down if you exceed the magic “33” feet has nothing to do with atmospheric pressure pushing anything up the tube, it has to do with degassing of dissolved gasses breaking the siphon.